Science

Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns from a brown solid to a black powder. He refers to several chemistry journals that claim this represents a chemical reaction. From his observation and research, he concludes that the substance goes through a chemical change when heated. How can Ethan best defend his conclusion?
A by demonstrating that the substance will eventually melt if the temperature continues to increase
B by verifying that the substance is now made up of different molecules than before it was heated
C by verifying that the substance is made up of only one type of element
D by demonstrating that the substance is less dense after it is heated

  1. 👍
  2. 👎
  3. 👁
  1. your answer?

    1. 👍
    2. 👎
    👤
    DrBob222
  2. We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

    1. 👍
    2. 👎
  3. The answer is B

    Hope I helped you! :)

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. science

    Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can

  2. Exponential Modeling

    The half-life of a radioactive substance is one day, meaning that every day half of the substance has decayed. Suppose you have 100 grams of this substance. How many grams of the substance would be left after a week?

  3. YAY SCIENCE!!🥳😇😇🥳🥳

    Part 6: Read the Passage below and complete the chart. Chemical & Physical Properties Each substance has its own unique combination of physical and chemical properties, and substances can be identified based on these properties.

  4. Math

    A radioactive substance decays according to the formula Q(t) = Q0e−kt where Q(t) denotes the amount of the substance present at time t (measured in years), Q0 denotes the amount of the substance present initially, and k (a

  1. science

    Imagine you have two beakers. Both beakers are filled with the same amount of water. The water in both beakers is the same temperature as well. You add 50 g of Substance A to the first beaker, and 50 g of Substance B to the second

  2. Biology

    Which of these best defines the term pollutant? A anything humans add to the atmosphere and oceans (My answer choice) B any substance that is harmful to the environment C any substance that is a waste product of industry D a

  3. algebra

    A radioactive substance decays according to the formula A=A0e^kt where A0 is the initial amount of substance (in grams) A is the amount of substance(in grams) after t years k is a constant The half-life of the substance is 10

  4. Sciences

    What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting? A crystalline solid A sublimation A pure substance •• An amorphous solid Correct me

  1. SCIENCE HELP! SOMEONE!

    A student compared some chemical and physical properties of three pure substances. Her data are recorded in the chart above. What is a logical conclusion the student can draw about pure substances? A student compared some chemical

  2. Science

    1.)​CaCO3→CO2​+CaO A scientist heats 30 grams of calcium carbonate (CaCO3) in the chemical reaction shown. What is the total mass of the products?(1 point) A.)10 grams B.)15 grams C.)60 grams

  3. Chemistry

    A forensic scientist is given a white substance that is thought to be cocaine. The substance is found to have a percent composition: 49.48% C, 5.19% H, 28.85% N, and 16.48% O. What is the empirical formula for this substance? Is

  4. Intergrated Science A

    Which answer choices best indicate that a substance has experienced a chemical change? Select all that apply. when the substance changes temperature when the substance changes shape when the substance changes volume when a new

You can view more similar questions or ask a new question.